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Every person likes prime numbers. Alice is a person, thus she also shares the love for them. Bob wanted to give her an affectionate gift but couldn't 阅读全文
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Given an array aa of length nn, find another array, bb, of length nn such that: for each ii (1≤i≤n)(1≤i≤n) MEX({b1MEX({b1, b2b2, ……, bi})=aibi})=ai. T 阅读全文
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You are given a matrix with nn rows (numbered from 11 to nn) and mm columns (numbered from 11 to mm). A number ai,jai,j is written in the cell belongi 阅读全文
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The only difference between easy and hard versions is the number of elements in the array. You are given an array aa consisting of nn integers. In one 阅读全文
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You are fighting with Zmei Gorynich — a ferocious monster from Slavic myths, a huge dragon-like reptile with multiple heads! Initially Zmei Gorynich h 阅读全文
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Monocarp and Bicarp live in Berland, where every bus ticket consists of nn digits (nn is an even number). During the evening walk Monocarp and Bicarp 阅读全文
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There is a white sheet of paper lying on a rectangle table. The sheet is a rectangle with its sides parallel to the sides of the table. If you will ta 阅读全文
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Suppose there is a h×wh×w grid consisting of empty or full cells. Let's make some definitions: riri is the number of consecutive full cells connected 阅读全文
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Let's introduce some definitions that will be needed later. Let prime(x)prime(x) be the set of prime divisors of xx. For example, prime(140)={2,5,7}pr 阅读全文
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You are playing a game where your character should overcome different obstacles. The current problem is to come down from a cliff. The cliff has heigh 阅读全文